fix: mermaid labels - quote and use newline instead of <br/>

TEST_STAND/LUCEE/SCHEMA.md

@@ -16,7 +16,7 @@ flowchart LR
     I8[param_h]
   end
 
-  PG[Postgres<br/>(БД)]
+  PG["Postgres\n(БД)"]
 
   subgraph Outputs [Выходные параметры]
     direction TB
@@ -30,7 +30,7 @@ flowchart LR
     O8[notification]
   end
 
-  LUCEE[[Lucee<br/>(шаблоны / app)]]
+  LUCEE["Lucee\n(шаблоны / app)"]
 
   I1 --> PG
   I2 --> PG